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I don't insist. It sounds reasonable.
So the correct will be:
"Я был на "Евгений Онегин" Чайковского or "Я посмотрел "Евгений Онегин" Чайковского".

The new question is Евгений should decline?...

Во первых, поздравляю всех с новым 2014 годом.
Спасибо за вашу помощь в 2013.

My first question for 2014 is for both Russian and English users.
What is the correct expression:
I watched /...